Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754755AbYCJRVZ (ORCPT ); Mon, 10 Mar 2008 13:21:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751158AbYCJRVS (ORCPT ); Mon, 10 Mar 2008 13:21:18 -0400 Received: from extu-mxob-1.symantec.com ([216.10.194.28]:48232 "EHLO extu-mxob-1.symantec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751111AbYCJRVR (ORCPT ); Mon, 10 Mar 2008 13:21:17 -0400 Date: Mon, 10 Mar 2008 17:19:32 +0000 (GMT) From: Hugh Dickins X-X-Sender: hugh@blonde.site To: Andi Kleen cc: Christoph Lameter , Andrew Morton , Ingo Molnar , KOSAKI Motohiro , Thomas Gleixner , LKML , Linus Torvalds , Bart Van Assche , Jeremy Fitzhardinge Subject: Re: quicklists confuse meminfo In-Reply-To: <87myp68r88.fsf@basil.nowhere.org> Message-ID: References: <20080309111456.GA21690@elte.hu> <20080309210000.C6DE.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20080309120940.GA1695@elte.hu> <20080309123432.GA3267@elte.hu> <20080309114640.85c9c3eb.akpm@linux-foundation.org> <87myp68r88.fsf@basil.nowhere.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1062 Lines: 26 On Mon, 10 Mar 2008, Andi Kleen wrote: > Christoph Lameter writes: > > > > Zeroed pages however will not address the issue of having initialized pgd > > (which seems to be what i386 needs). > > pgd is tiny on i386 PAE (4 * 16 bytes). Are you sure reinitializing that > is a serious issue? ... It used to be tiny (32 aligned bytes), then 2.6.22's quicklist enlarged that to a whole (lowmem) page. I think we were all too busy with other stuff to protest loudly enough about that bloat. If the quicklists are going, it'd be good for PAE to go back to a kmem_cache of 32-byte entries as in 2.6.21 - I think Ingo's patch is still using a whole page there. Or have sl?b alignment changes, or virtualization issues (locking per underlying struct page?), made a kmem_cache awkward there now? Hugh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/